FAA proposes rule for Airbus Helicopters regarding missing diodes

The Federal Aviation Administration is proposing a new airworthiness directive for certain Airbus Helicopters Model AS350 B2 helicopters. The proposal addresses an unsafe condition identified by the European Union Aviation Safety Agency, which found that some of these aircraft may be missing or have faulty diodes in their hydraulic circuits.

Why it matters: This action targets a specific mechanical defect that could compromise helicopter handling. While the number of affected aircraft in the United States is small, the risk involves direct control systems. Fixing it ensures the hydraulic assistance functions as designed during flight operations.

Who it affects

• Owners and operators of Airbus Helicopters Model AS350 B2 helicopters registered in the U.S.

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This is a proposed rule from the Federal Aviation Administration published in the Federal Register; you should check the original document at regulations.gov under Docket No. FAA-2026-4646 before relying on it.

Agency: Transportation Department, Federal Aviation Administration
Source: Federal Register — read the official document